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CN-122025794-A - Battery monomer, preparation method thereof, battery device, power utilization device and energy storage device

CN122025794ACN 122025794 ACN122025794 ACN 122025794ACN-122025794-A

Abstract

The application relates to the field of batteries, and provides a battery monomer, a preparation method thereof, a battery device, an electric device and an energy storage device, wherein the battery monomer comprises a battery core assembly, a battery shell and a battery shell, wherein the battery core assembly is formed by laminating or winding a positive plate, a solid electrolyte membrane and a negative plate; the solid electrolyte membrane is provided with a three-dimensional interpenetrating network structure and comprises a ceramic framework and a polymer filling phase, wherein the ceramic framework is enriched on one side close to the negative electrode plate, the polymer filling phase is enriched on one side close to the positive electrode plate, the ceramic framework is provided with a communicating pore canal, and the communicating pore canal is in a honeycomb hexagon or a quasi hexagon. The present application is at least advantageous in providing a through fast path for ion conduction.

Inventors

  • CHEN JING
  • SHI HAOTIAN
  • YANG ZIXIANG
  • WU YUHAO

Assignees

  • 浙江晶科储能有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (17)

  1. 1. A battery cell, comprising: The battery cell assembly is formed by laminating or winding a positive plate, a solid electrolyte membrane and a negative plate; the battery cell assembly is positioned in the shell; The solid electrolyte membrane is provided with a three-dimensional interpenetrating network structure and comprises a ceramic framework and a polymer filling phase, wherein the ceramic framework is enriched near one side of the negative electrode plate, the polymer filling phase is enriched near one side of the positive electrode plate, the ceramic framework is provided with a communication pore canal, and the communication pore canal is in a honeycomb hexagon or a quasi hexagon.
  2. 2. The battery cell according to claim 1, wherein, in a thickness direction of the solid electrolyte membrane, a side near the negative electrode sheet is denoted as an inner layer of the solid electrolyte membrane, a side near the positive electrode sheet is denoted as an outer layer of the solid electrolyte membrane, a mass fraction of the ceramic skeleton in the inner layer is 70% -95%, a mass fraction of the polymer filled phase is 5% -30%, a mass fraction of the ceramic skeleton in the outer layer is 20% -50%, and a mass fraction of the polymer filled phase is 50% -80%.
  3. 3. The battery cell according to claim 1 or 2, wherein the porosity of the communicating pore canal in the ceramic skeleton is 20% -70%, the equivalent pore diameter of the communicating pore canal is 100 nm-5000 nm, and the wall thickness is 30 nm-200 nm.
  4. 4. The battery cell of claim 3, wherein the material of the ceramic backbone is an inorganic solid state electrolyte.
  5. 5. The battery cell of claim 4, wherein the inorganic solid state electrolyte comprises at least one of a garnet-type solid state electrolyte and a NASICON-type solid state electrolyte.
  6. 6. The battery cell according to claim 1, wherein the material of the polymer-filled phase comprises at least one of polyether polymer, polyvinylidene fluoride-hexafluoropropylene copolymer, and polypropylene carbonate, and the number average molecular weight of the polyether polymer, polyvinylidene fluoride-hexafluoropropylene copolymer, and polypropylene carbonate is 1000g/mol to 100000g/mol.
  7. 7. The battery cell of claim 6, wherein the polyether polymer comprises polyethylene oxide or a copolymer thereof.
  8. 8. The battery cell of claim 6 or 7, wherein the polymer fill phase further comprises a lithium salt.
  9. 9. The battery cell of claim 8, wherein the molar ratio of the lithium salt to the ether oxygen units in the polymer filled phase is 0.01 to 0.20.
  10. 10. The battery cell of claim 8, wherein the polymer fill phase further comprises a low crystallinity regulatory component.
  11. 11. The battery cell of claim 10, wherein the low crystallinity control component is present in an amount of 0.1% to 10% by mass of the polymer filler phase.
  12. 12. The battery cell of claim 11, wherein the low crystallinity control component comprises at least one of an ionic liquid, a plasticizer, and an oligomer.
  13. 13. A method for producing the battery cell according to any one of claims 1 to 12, comprising: Providing a solid electrolyte membrane, a positive plate, a negative plate and a shell; Winding the positive plate, the solid electrolyte membrane and the negative plate or laminating the positive plate, the solid electrolyte membrane and the negative plate, and then placing the positive plate, the solid electrolyte membrane and the negative plate into a shell to form an initial battery cell; and performing a formation step.
  14. 14. The method for producing a battery cell according to claim 13, wherein the method for producing a solid electrolyte membrane comprises: Preparing a ceramic skeleton; Preparing a plurality of polymer impregnating solutions with different concentrations, respectively impregnating the ceramic skeleton, and then pre-crosslinking by means of illumination or heating; and curing in an inert atmosphere to form a polymer filling phase, thereby obtaining the solid electrolyte membrane.
  15. 15. A battery device, characterized by comprising the battery cell according to any one of claims 1-12 or the battery cell obtained by the preparation method of the battery cell according to any one of claims 13-14, wherein the battery device comprises one or more of a battery module, a battery pack and an energy storage battery.
  16. 16. An electric power consumption device, characterized in that it comprises a battery device according to claim 15, the battery device is used for providing electric energy.
  17. 17. An energy storage device comprising the battery device of claim 15 for storing electrical energy.

Description

Battery monomer, preparation method thereof, battery device, power utilization device and energy storage device Technical Field The application relates to the field of batteries, in particular to a battery monomer, a preparation method thereof, a battery device, an electricity utilization device and an energy storage device. Background All-solid-state lithium ion batteries have inherent high safety, wide operating temperature range, and high energy density potential, which are directly related to the performance of the core component solid-state electrolyte of the all-solid-state battery. Currently, solid electrolytes mainly include three major classes, polymer electrolytes, inorganic ceramic electrolytes, and composite electrolytes. The polymer electrolyte has good flexibility and interface adaptability, but relatively low ionic conductivity, and the inorganic ceramic electrolyte has high ionic conductivity and wide electrochemical window, but has large brittleness and poor interface contact. Composite electrolytes attempt to combine the advantages of both, but the prior art still faces challenges such as uneven filler dispersion, poor interfacial compatibility, complex preparation process, etc. In this context, how to design a novel composite solid electrolyte with a regular structure, excellent performance and controllable preparation process becomes a key scientific problem for pushing the industrialization of all-solid-state battery technology. In particular, while maintaining high ionic conductivity, good mechanical properties and interface stability are achieved, and systematic innovations from multiple dimensions such as material design, structural construction, and interface engineering are required. Disclosure of Invention The application provides a battery monomer, a preparation method thereof, a battery device, an electricity utilization device and an energy storage device, which are at least beneficial to providing a through rapid channel for ion conduction. In a first aspect, the present application provides a battery cell comprising: The battery cell assembly is formed by laminating or winding a positive plate, a solid electrolyte membrane and a negative plate; the battery cell assembly is positioned in the shell; The solid electrolyte membrane is provided with a three-dimensional interpenetrating network structure and comprises a ceramic framework and a polymer filling phase, wherein the ceramic framework is enriched near one side of the negative electrode plate, the polymer filling phase is enriched near one side of the positive electrode plate, the ceramic framework is provided with a communication pore canal, and the communication pore canal is in a honeycomb hexagon or a quasi hexagon. The ceramic skeleton is enriched on one side close to the negative plate, high modulus support is provided for inhibiting lithium dendrite, and the polymer filling phase is enriched on one side close to the positive plate, so that flexible buffering and interface adaptability are provided. Optionally, along the thickness direction of the solid electrolyte membrane, one side close to the negative electrode plate is marked as an inner layer of the solid electrolyte membrane, one side close to the positive electrode plate is marked as an outer layer of the solid electrolyte membrane, in the inner layer, the mass fraction of the ceramic skeleton is 70% -95%, the mass fraction of the polymer filling phase is 5% -30%, in the outer layer, the mass fraction of the ceramic skeleton is 20% -50%, and the mass fraction of the polymer filling phase is 50% -80%. Optionally, the porosity of the communicating pore canal in the ceramic skeleton is 20% -70%, the equivalent pore diameter of the communicating pore canal is 100-5000 nm, and the wall thickness is 30-200 nm. Wherein the equivalent aperture is the diameter of a circle with the same cross-sectional area as the communication pore canal. Optionally, the material of the ceramic skeleton is an inorganic solid electrolyte. Optionally, the inorganic solid electrolyte includes at least one of garnet-type solid electrolyte and NASICON-type solid electrolyte. Optionally, the garnet-type solid state electrolyte comprises Li7La3Zr2O12、Li5La3Nb2O12、Li5La3Ta2O12、 doped with at least one of Li 7La3Zr2O12. Optionally, in the doped Li 7La3Zr2O12, the doping element includes at least one of Al, ta, ga, nb, and the doping concentration is 0.1mol% to 1mol%. Optionally, the NASICON-type solid state electrolyte includes at least one of Li1.3Al0.3Ti1.7(PO4)3、Li1.5Al0.5Ge1.5(PO4)3. Optionally, the material of the polymer filling phase comprises at least one of polyether polymer, polyvinylidene fluoride-hexafluoropropylene copolymer and polypropylene carbonate, and the number average molecular weight of the polyether polymer, the polyvinylidene fluoride-hexafluoropropylene copolymer and the polypropylene carbonate is 1000 g/mol-100000 g/mol. Optionally, the polyether polymer comprises po